[ovs-dev] [PATCH] INSTALL.DPDK.md: Correct mergeable buffers parameter.

Stokes, Ian ian.stokes at intel.com
Tue Feb 16 12:13:12 UTC 2016


> -----Original Message-----
> From: Flavio Leitner [mailto:fbl at sysclose.org]
> Sent: Friday, February 12, 2016 1:47 AM
> To: Stokes, Ian
> Cc: dev at openvswitch.org
> Subject: Re: [ovs-dev] [PATCH] INSTALL.DPDK.md: Correct mergeable
> buffers parameter.
> 
> On Wed, 10 Feb 2016 10:50:54 +0000
> Ian Stokes <ian.stokes at intel.com> wrote:
> 
> > Update the mergeable buffers paramaters in performance tuning to the
> > correct parameter mrg_rxbuf.
> >
> > Signed-off-by: Ian Stokes <ian.stokes at intel.com>
> > ---
> >  INSTALL.DPDK.md |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> >
> > diff --git a/INSTALL.DPDK.md b/INSTALL.DPDK.md index d892788..0f340e5
> > 100644
> > --- a/INSTALL.DPDK.md
> > +++ b/INSTALL.DPDK.md
> > @@ -392,7 +392,7 @@ Performance Tuning:
> >  	This behavior is typically supported and enabled by default,
> however
> >  	in the case where the user knows that rx mergeable buffers are not
> needed
> >  	i.e. jumbo frames are not needed, it can be forced off by adding
> > -	rx_mrgbuf=off to the QEMU command line options. By not reserving
> multiple
> > +	mrg_rxbuf=off to the QEMU command line options. By not reserving
> > +multiple
> >  	chains of descriptors it will make more individual virtio
> descriptors
> >  	available for rx to the guest using dpdkvhost ports and this can
> improve
> >  	performance.
> 
> $ qemu-system-x86_64 -device virtio-net-pci,help 2>&1 | grep mrg virtio-
> net-pci.mrg_rxbuf=bool (on/off)
> 

Thanks Flavio, that command is very useful. 
Do you think it should be added to the patch or was it meant as an FYI?

> Acked-by: Flavio Leitner <fbl at sysclose.org>
> 
> --
> fbl




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